This is free and unencumbered software released into the public domain.

App Trayer

Simply tray apps by {Ctrl}+{MClick} aka mouse middle button and Ctrl on a window.
To restore window, just right click on App Trayer tray icon, then rest you'll figure out.

Alt Hotkeys

Choose between: MButton, Ctrl+MButton, or Ctrl+Shift+MButton!

License

Unlicense, no rights reserved.